Scenario 1: Only the glass is broken or detached.
This is the easiest scenario. You'll need a replacement mirror glass specifically designed for your 1999 S10. These are usually relatively inexpensive and available at auto parts stores or online. The new glass will likely have adhesive already applied to the back.
1. Clean the surface: Thoroughly clean the remaining mounting bracket on the mirror housing. Use a degreaser and a clean cloth to remove any dirt, dust, or old adhesive. Allow to dry completely.
2. Align and apply: Carefully align the new mirror glass with the mounting bracket. Firmly press it into place, ensuring even contact. Hold it for a few minutes to allow the adhesive to begin setting.
3. Cure: Follow the adhesive's instructions for curing time. This usually involves avoiding vibration or jarring the mirror for several hours.
Scenario 2: The entire mirror assembly is detached.
This is more complex and might involve different mounting methods depending on the exact S10 model. It could be held on by:
* Clips: These are usually plastic and can break. Examine the mirror base and the mounting point on the windshield. You might need to carefully pry the mirror back into position if the clips are still intact, using a plastic pry tool to avoid damage.
* Adhesive: If the mirror was glued on, this is trickier. You'll likely need to clean the old adhesive from both the mirror base and the windshield mounting surface. Then, you will use a new adhesive, possibly automotive-grade epoxy or a specialized mirror mounting adhesive. Ensure the surface is perfectly clean and dry before applying the adhesive. Follow the adhesive manufacturer's instructions carefully.
Before you start either scenario:
* Identify the mirror type: Determine if your mirror is a manual or power mirror. This affects the replacement parts you will need.
* Consult a repair manual: A repair manual specific to your 1999 S10 will provide detailed diagrams and instructions, especially helpful if the entire assembly needs to be reattached.
* Gather necessary tools: This might include screwdrivers (possibly Phillips and flathead), plastic pry tools, a degreaser, clean cloths, and potentially a new adhesive if needed.
Important Notes:
* Safety: Be careful when working around the windshield to avoid causing cracks or damage.
* Adhesives: Use the correct type of adhesive. Improper adhesive can cause the mirror to fall off or damage the windshield.
* Professional help: If you're not comfortable with this repair, consider taking your S10 to a professional auto glass shop or mechanic. They have the experience and tools to do it correctly.
Without seeing the specific issue, these are general guidelines. Provide more detail about *why* the mirror needs reapplying (e.g., broken glass, detached assembly, etc.) for more precise instructions. Pictures would also be incredibly helpful.
